<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
     <el-header>
         <div>
             <img src="../assets/heima.png" alt="">
             <span>电商后台管理系统</span>
         </div>
         <el-button type="info" @click="logout">退出</el-button>
     </el-header>
     <!-- 页面主题区域 -->
  <el-container>
      <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollpse">|||</div>
        <!-- 侧边栏菜单区 -->
         <el-menu background-color="#333744" text-color="#fff" active-text-color="#409BFF" unique-opened :collapse="isCollapse" :collapse-transition="false" :router='true' :default-active="activePath">
             <!-- 一级菜单 -->
      <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id" >
          <!-- 一级菜单的模板区 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
          <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
            <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
          </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
    export default{
        data () {
            return {
                //左侧菜单数据
                menulist:[],
                iconsObj:{
                    '125':'iconfont icon-user',
                    '103':'iconfont icon-tijikongjian',
                    '101':'iconfont icon-shangpin',
                    '102':'iconfont icon-danju',
                    '145':'iconfont icon-baobiao'
                },
                isCollapse:false,
                // 被激活的链接地址
                activePath:''
            }
        },
        created(){
            this.getMenuList()
            this.activePath = window.sessionStorage.getItem('activePath')
        },
        methods:{
            logout:function(){
                window.sessionStorage.clear();
                this.$router.push('/login');
            },
           async getMenuList(){
              const{data:res} = await this.$http.get('menus')
             if(res.meta.status !==200) return this.$message.error(res.meta.msg)
             this.menulist = res.data
            },
            //点击事件切换菜单的展开与折叠
            toggleCollpse:function(){
                this.isCollapse = !this.isCollapse
            },
            //保存链接的激活状态
            saveNavState:function(activePath){
                    window.sessionStorage.setItem('activePath',activePath)
                    this.activePath = activePath
            }
        }
    }
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    >div{
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
}
.el-main{
    background-color: #EAEDF1;
}
.iconfont {
    margin-right: 8px;
}
.toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    color: #fff;
    line-height: 24px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>